RV AC units are interchangeable. This is true as long as you replace the whole unit and not just one part.
RV stands for 'Recreational Vehicle'.
Only when your car engin runs.
The RV has a 12 Volt DC power supply that operates all the 12 Volt DC items in your RV when your plugged in to 110 V AC.
Revolver maybe
It means the engine is in the rear of the bus or RV.
The electrical system is taking too much power. The shed light comes on when a relay shuts down an airconditioning unit until there is sufficient power to run them both.
Need to know a make and model, both of the chassis, and the RV body manufacturer. RVs come in many shapes and sizes, and will have different specs for their AC systems.
If you mean a built-in system for your RV, or something attached to the top of your RV, this site may be useful to you: www.amsolar.com/ If you mean a small portable generator that is not attached to your RV, and you want to use it to power appliances in your RV, that option is not as easy. Generators tend to be heavy units and take up a lot of space.
Depends on the wiring of your RV. Some RV's are 30 amp, some are 50 amp. The 50 amp RV will use two separate circuits. Using two separate circuits in this circumstance is disastrous. But you shouldn't need more than 20 amps for your AC. 2500 watts is only about 10 amps.
It means Rateable Value
If you mean RB, then it is Regulus Black.